_Combretum_ presents several points in common with Rhamneae; valvate calyx, and tendency to want of petals; to Elaeagneae in calyx and furfuraceous scales; a decandrous Rhamneae would differ but little in flowers from Combretum.

The harsh, dry skin, epidermic and papillary hypertrophy, the furfuraceous or plate-like scaliness, the greater development upon the extensor surfaces, a history of the affection dating from early childhood, and the absence of inflammatory symptoms.

It is characterized by small and large, slightly furfuraceous, reddish-yellow or reddish-brown patches, occurring usually on warm and moist parts, such as the axillary, inguinal, anal and genitocrural regions.